This setup incredibly well and i'm very happy with the sound all round my house, controllable from my Mac Mini through iTunes.

However, what I would like to be able to do is control iTunes remotely. I would like a device (iPod, iPhone, etc) that could connect to the iTunes running on my Mac Mini via WiFi and then show me my playlists, etc and I want to be able to change songs, change playlists, browse my iTunes, etc, all remotely.

And there is such a thing called the Apple Remote Works a dream.
As long as Home Sharing is Turned on, and everything is on the same WiFi network then thats the one.

Many thanks for this advice! I actually don't yet own an iPhone, iPad or iPod Touch so I was just about to buy one for controlling iTunes remotely using the app that you mentioned.

However, just by chance I checked out similar apps on Android (as I own an Android-based phone and tablet). Lo and behold, I found a free app that worked immediately once i'd entered the pin to share my iTunes.

That's a few hundred quid saved so thanks for pointing me in the right direction!

For anyone in the same situation as me, i.e. has a Mac computer running iTunes through Airplay-compatible speakers and Android-based phones and tablets, I highly recommend the ReTune Android app. It works like a dream and I have it on my phone and tablet and can control iTunes on my Mac from either.

Whilst the app is free, the author will take PayPal donations if you think it's worth it.